<template>
  <nav-bar>
    <div slot="left" class="back" @click="backClick"><img src="~assets/img/common/back.svg" alt=""></div>
    <div slot="center" class="title">
      <div v-for="(item,index) in title" class="item" :class="{active: currentIndex === index}" @click="titleClick(index)">{{item}}</div>
    </div>
  </nav-bar>
</template>

<script>
import NavBar from 'components/common/navbar/NavBar'
export default {
  name: 'DetailNavBar',
  components: {
    NavBar,
  },
  data() {
    return {
      title: ['商品', '参数', '评论', '推荐'],
      currentIndex: 0
    }
  },
  methods: {
    titleClick(index) {
      this.currentIndex = index
      this.$emit('titleClick', index)
    },
    backClick() {
      this.$router.back()
    }
  }
}
</script>

<style scoped>
  .title {
    display: flex;
  }

  .item {
    flex: 1;
  }

  .active {
    color: var(--color-high-text);
  }

  .back img{
    vertical-align: middle;
  }
</style>